The primary role of engine oil has been lubrication and it has not changed, but what has changed are the different types and grades of engine oils available in the market. The major difference between 5w30 and 10w30 is the viscosity in freezing temperatures. The more ‘fluid’ nature of 5w30 at a lower temperature … Continue reading 5w30 vs 10w30 | Crucial Differences + Imp. FAQs